How to Customize the New 2.7 ArgumentParser Library Class (module argparse)?
tom.browder at gmail.com
Fri Aug 20 21:32:54 CEST 2010
I have converted from OptionParser to ArgumentParser (new in version
2.7) to great advantage, and I think it's a great improvement! But
now I want to customize the help formatting just a bit.
The documentation is sketchy here, but I started by subclassing
ArgumentParser and attempted to redefine format_usage, but after
looking at the detailed instructions with pydoc I see "the API of the
formatter objects is still considered an implementation detail."
I take that to mean I should abandon such efforts at the moment.
So, using the defined class as is, and following instructions in the
online docs, I have been able to get my output to look like this:
$ test_argparser.py -h
usage: test_argparser.py [options]
A program to manipulate user programs.
-h, --help Show this help message and exit.
-v, --version Show program's version number and exit.
-s, --show Show a list of user post-processing programs.
To beautify things I would like to change two strings which are
auto-generated by the standard parser:
1. change "usage:"
to "Usage:" # capitalize 'usage'
2. change "optional arguments:"
to "Optional arguments:" # capitalize 'Optional'
Does anyone know how to do it without modifying source code?
Thomas M. Browder, Jr.
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